Abstract
The newborn has a limited ability to regulate H+/HCO-3 homeostasis, due in part to immaturity of the intercalated cells in the distal nephron. We traced the postnatal differentiation of the intercalated cells of the rabbit cortical collecting duct (CCD) and outer medullary collecting duct(OMCD) using MAb to the 31-kD subunit of the vacuolar H+-ATPase, membrane portion of erythrocyte band 3, and apical surface of B-intercalated cells (peanut agglutinin [PNA], MAb B63). In the most superficial CCD of the newborn there was no binding to these probes, although deeper in the cortex there was faint apical staining with PNA and MAb B63 and a few patterns of H+-ATPase and band 3 labeling of neonatal intercalated cells. The OMCD showed mostly apical H+-ATPase and both cytoplasmic and basolateral band 3 labeling but B-intercalated cell markers were not seen. By 3 wk of age the staining of the CCD and OMCD was more polarized, resembling those in the adult. Band 3 positive cells (as a percentage of total cells) in the CCD increased from 13 to 17% during maturation, and in the OMCD they increased from 22 to 37%. Some basolateral band 3 and apical H+-ATPase staining was also seen in the inner medullary collecting duct of 3-wk-old rabbits to a greater extent than in newborn or adult rabbits. Labeling of intercalated cells in the CCD and OMCD was weakest and least numerous in the newborn, greater in the 3 wk old, and greatest in the adult. Most maturing cortical intercalated cells bound both PNA and H+-ATPase MAb, comparable to what has been observed in the adult CCD. PNA-negative cells showing apical H+-ATPase labeling, consistent with the classic A-intercalated cell phenotype, comprised only 5% of identified intercalated cells in the newborn CCD compared with 12% in older animals. In or near the developing renal vesicles and ampullary structures were occasional cytoplasmically staining PNA- and B63-positive cells. Whether these cells are precursors of specific renal tubular cells cannot yet be established. Staining for principal cells(ST.9) was less intense in the neonatal cortex than in more mature cortex, but the deep cortex and outer medulla were heavily labeled at all ages. These data indicate that immature intercalated cells, in the CCD and OMCD, may undergo significant postnatal proliferation and differentiation, acquiring mature phenotypes during the first month of life. The A-intercalated cell appears more differentiated than the B cell during the 1st wk of life, suggesting that A-intercalated cells contribute more than B cells to the maintenance of acid-base homeostasis in the newborn.
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Abbreviations
- CCD:
-
cortical collecting duct
- OMCD:
-
outer medullary collecting duct
- IMCD:
-
inner medullary collecting duct
- PNA:
-
peanut agglutinin
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Acknowledgements
The authors are grateful to Dr. Stephen Gluck for providing the MAb E11 to the 31-kD subunit of the vacuolar H+-ATPase and to Dr. Victor Schuster for the MAb IVF12 to the membrane domain of erythrocyte band 3.
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Supported by National Institutes of Health Grants HD13232 to G.J.S. and DK39523 and DK45647 to G.F.-T.
Parts of this material were presented at the Fifth International Workshop on Developmental Nephrology, Tremezzo, Como, Italy, 26–28 August 1992.
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Matsumoto, T., Fejes-Toth, G. & Schwartz, G. Postnatal Differentiation of Rabbit Collecting Duct Intercalated Cells. Pediatr Res 39, 1–12 (1996). https://doi.org/10.1203/00006450-199601000-00001
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DOI: https://doi.org/10.1203/00006450-199601000-00001
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